Intent 1:
To limit the probability of:
- if not enough fasteners were used, the displacement
of shingles under wind-uplift and gravity loads,
- if too many fasteners were used, the splitting of shingles
under loads imposed by the shrinkage of shingles, or
- if fasteners were exposed to water, corrosion, which
could lead to a reduction in the fasteners' ability to resist expected
loads, which could lead to the displacement of shingles.
This is to limit the probability of
water penetrating directly to roof decking or sheathing, which could
lead to deterioration, which could lead to the structural failure
of roofs or assemblies protected by roofs, which could lead to harm
to persons.